Author/Authors :
Shanthi, Shanmugam Research and Development Centre - Bharathiar University - Coimbatore – 641 046 - Tamil Nadu, INDIA , Asghar, Basim Hussain Department of Chemistry - Faculty of Applied Sciences - Umm Al-Qura University - Makkah, SAUDI ARABIA , Mansoor, Syed Sheik Department of Chemistry - C. Abdul Hakeem College (Autonomous) - Melvisharam - 632 509 - Tamil Nadu, INDIA
Abstract :
The oxidation of Mandelic Acids (MA) to the corresponding oxoacids with
tripropylammonium fluorochromate (TriPAFC) in aqueous acetic acid has been studied.
The reaction is first order with respect to [TriPAFC], [MA] and [H+]. The oxidation of
α-deuteriomandelic acid shows the presence of a primary kinetic isotope effect (kH/kD = 5.54 at 303 K).
The reaction has been found to be catalyzed by H+ ions. The various thermodynamic parameters
for the oxidation have been reported and discussed along with the validity of the isokinetic
relationship. The Exner plot showed that all the selected mandelic acids are oxidized by the same
mechanism.
Keywords :
Iso-kinetic temperature , Hammett plot , Tripropylammonium fluorochromate , Mandelic acid
